Center joint form



Jan. 4, 1949. R. R. ROBERTSON 2,458,303

CENTER JOINT FORM Fileu Jan. 16, 1946 2 Sheets-Sheet l .ii fi f VI EFJYEF I ROBERT R, Roasnrsou Jan. 4, 1949. I R. R. ROBERTSON 2,458,303

CENTER JOINT FORM Filer: Jan. 16, 1946 2 Sheets-Sheet 2 [ZWFEfiEF Roasnr R. Roamrsou Patented Jan. 4, 1949 Application January 16, 1946,'Seria1 No. 641,470

2 Claims.

-1 "This inventionpertains to concrete construction joints, and more'particularly to road center joint'forms constructed to'permit the road slabs forming opposite lanes of aroad tobe tied together'without the use of the ordinary types of :5

tie bars.

The improved center joint form or" this invention'is adapted to be placed longitudinally along the center line of a roadsubgrade, and said form is punched out or'cut to provide a plurality of anchoring units which are so constructed that they-may 'be pivotally swung out of the plane of the'form into positions at right angles thereto to "provide anzhoring lugs or wings projecting from opposite sides of the form to be embedded in the concrete forming'the slabs of the adjacent road lanes to tie the lanes together without necessitating'the use of the ordinary types of tie bars.

It isan object of'this invention to provide an improved and simplified form of center joint form consisting of a main body or plate having integrally formed thereon anchoring means which 'areadapted to be swung out of the plane of the form to project in opposite directions from the form to 'facilitatetying of the oppositeslabs together when the form is embedded in concrete which forms the slabs of adja :ent road lanes.

A further object of the invention is the con struction of a center joint form wherein the form plate has cut or struck therefrom a plurality of anchoring'members which are so formed that they have anintegral connection with the body formed out of the materialof the'iorm to permit the anchoring'members to be pivotally swung in either direction to project from opposite sides or the form to position the'anchoring menibers either vertically or horizontally at right angles to the planeof the form, depending upon whether the anchoring "members :are swung longitudinally 'ortransverse'ly with respect tothe 'form.

It isfurthermore an object of this invention to provide a road joint form of simple and slice- 'tive construction wherein the body of the form "maybe either a fiat'platemr'a' plate formedwith "channels or beads, said body of the 'form, whether plain "or channeled, adapted to have anchoring members integrally formed therewith and so connected to theform body that the anchoring members may be pivotally swung in one direction or'another to'permit opposite ends of the an'shoring members to project from opposite sides of the form body and serve as anchoring means for tying the slabs-of adjacent road-lanes together.

It is an important object of this invention to provide a road joint form wherein a body plate has cut therefrom a plurality of anchoring mem- "bers 'each consisting of two blades of different shapes disposed in the same plane and adapted to be'projectedfrom opposite sides of t'he'form plate by simply hingeclly swinging the anchoring members out of the plane of the plate on integral connections joining the anchoring members with the plate.

Itis an important ob ect of this invention to provide a road joint'form consisting of a body plate adapted to be supported on a road subgrade byany suitable standard means with said plate having cut or formed therefrom a plurality of anchoring members each consisting of oppositely projecting anchoring blades disposed in the same plane and adapted to be projected fromopposite sides of the joint plate into either vertical or horizontal planes, depending upon the positioning of the anchoring members with respect to the body plate. I

Other and further important objects and features ofthe invention-will be apparent from the disclosures in the'specification and the accompanying drawings.

The invention '(in preferred forms) is illus- 'trated in the drawings and hereinafter more fully desaribed.

On the drawings:

Figure 1 is alfragmentary vertical detail section transversely across the middle portion of a concrete road, .lthelopposite lane slabs of which are indicated in dotted lines andare-separated by means of a center joint'torm embodying the principles of this invention and providing a means for tying the opposite slabs together without the use of tie bars;

Figure 2 is a'fragrnentary side'elevational view of the center joint forming-mechanism, with the concrete omitted, showing the anchoring members dis-posed longitudinallyof'the middle section of the joint body plate, with the anchoring membersstill-disposed in theplane of the middle section of the plate from which they are formed;

Figure 3 is a top plan view of a fragmentary portion of the improved center joint form, of the type illustrated in Figure 2 but with the anchoring members swung out of the plane of the form and disposed at right angles with respect thereto to project from opposite sides of the form;

Figure 4 is a fragmentary isometric view of the center joint form showing the anchoring members pivotally swung from the form body, with the opposite ends of the members of different shapes and projecting from opposite sides of the form body.

Figure 5 is a vertical transverse sectional view of a modified form of center joint form in which the body plate is substantially plain and has reinforcing ribs longitudinally formed thereon above and below the anchoring members which are swung out of the plane of the form plate with adjacent anchoringmembers swung out in opposite directions to stagger or alternate the like formed ends of the anchoring members.

Figure 6 is a fragmentary side elevational view of another modified form of center joint form in which the anchoring members are disposed transversely oi the form plate and are pivotally swung out of the plane of the body plate into horizontal planes and with the adjacent anchoring members reversed with respect to one another;

Figure 7 is a fragmentary top plan view of the modified form of center joint form illustrated in Figure 6;

Figure 8 is a vertical sectional view of the modified form of center joint form with said section being taken on line VIII-VIII of Fig ure 6;

Figure 9 is a fragmentary side elevational view of another modified form of center joint forming mechanism wherein the body of the plate is formed with a center channel from which the anchoring members are cut vertically with respect to the plate permitting the anchoring mem bers to be pivotally swung transversely in either direction to be disposed in horizontal planes; and

Figure 10 is a transverse sectional view of the center joint form, with said section taken on line X-X of Figure 9.

As shown on the drawings:

In the present invention the improved road center joint forming mechanisms, while being shown in several modified forms, are nevertheless all of a type in which the form body plate has cut or struck therefrom a plurality of anchoring members which are hingedly connected to the body plate to permit the anchoring members to be swung in either direction so that the ends of the anchoring members may project from opposite sides of the joint plate and be disposed in either vertical or horizontal planes to provide means for tying adjacent slabs of opposite road lanes together without resorting to the use of tie rods or the l ke.

Whi e the jo nt forming mechanism is preferably desi ned for use as a center joint form. it is to be understood that the slab connecting units may be used for other purposes such as the tying to ether of ad acent blocks or slabs of concrete floors or the like.

The center joint form as illustrated in Figures 1 to 4 inclusive is adapted to be supported on a road subgrade I by means of a supporting base unit 2 which is seated longitudinally upon the center line of the subgrade l and is channeled for the reception of the lower margin of a center joint slabs 4 and 5 together, the center-"plate section 6 of the channel portion of the body plate has cut or stamped therefrom a, plurality of spaced aligned anchoring members. Each of the anchoring members comprises a rectangular anchoring blade 8 and a tapered anchoring blade 9, the tapered narrow end of which is integrally connected with one end of the rectangular anchoring blade 8. The blades 8 and 9 are respectively cut from the plate section 6 along the lines H] and l I, leaving uncut portions l2 which integrally and hingedly connect the inner end of the rectangular anchoring blade 8 with the center plate 6 on opposite sides of the inner narrow end of the tapered anchoring blade 9. The integral connecting sections l2 are adapted to serve as hinges whereby the blades 8 and 9 of each of the anchoringmembers are adapted to be pivotally swung out of the plane of the center plate section 6 into positions preferably at right angles to the plane of the form body plate. The anchoring members may be pivotally swung out of the plane of the form plate so that all of the rectangular anchoring blades 8 project from the opposite side thereof. If desired, the anchoring members may be pivoted about the hinge connections l2 so that the rectangular anchoring blades and the taperedanchoring blades of adjacent anchoring members may project in opposite directions.

After the channel-shaped center joint form'is vertically supported longitudinally along. the

center line of the subgrade I by means of suitable supports 2, concrete is poured on opposite sides of the form to form the slabs 4 and 5 of I4 and I5 which alternately project from opposite sides of the plate l3 to reinforce the same. If desired, the ribs may project from the same side of the plate. Cut or struck from the longitudinal center portion of the body plate l3 are spaced anchoring members such as those illustrated and described in connection with Figures 1 to 4 inclusive and said members are designated by corresponding reference numerals.

Figures 6 to 8 inclusive illustrate another modified form of center joint form comprising a plain or flat body plate [6 which is adapted to be supported on a subgrade by means of supporting base members 2 or other suitable means. The modified form of body plate [6 is cut or stamped vertically at spaced intervals along the lines I! and I8 to respectively form tapered anchoring blades l9 and rectangularanchoring blades 20. When the anchoring blades l9 and 20 are swung out of the plane of the plate l6, they leave the openings formed by the cuts 1'! and 18. The narrow end of each of the anchoring blades I9 is integrally connected with one end of the adjacent rectangular anchoring blade 20 and the marginal portions of the blade 20 on opposite sides of the narrow end of the anchoring blade I9 are integrally connected with the plate M5 by portions which serve as hinges when the anchoring members are bent out of the plane of the body plate. The anchoring members may be bent out of the plane of the plate I6 with all of the tapered anchoring blades I9 disposed on one side of the plate and the rectangular anchoring blades 20 on the opposite side of the plate, or the anchoring members may be alternately bent out in opposite directions so that the tapered anchoring blades l9 and the rectangular anchoring blades 20 are staggered on opposite sides of the form plate.

Figures 9 and illustrate another modified form of the center joint forming mechanism comprising a body plate 2| having the middle portion thereof shaped to provide a channel section 22 from which anchoring members are arranged transversely or across the channel section. The anchoring members are formed by cutting the channel section along the lines I1 and I8 to provide a tapered anchoring blade l9 and a rectangular anchoring blade 20 similar to the arrangement shown in Figures 1 to 8 inclusive.

It will accordingly be noted from the description hereinbefore given, that the improved center joint form consists of a joint forming body plate, either of plain or channeled construction or provided with reinforcing ribs or of any selected form of reinforcing means. The body plate has cut or struck therefrom dual anchoring members which are preferably disposed in the same plane and are adapted to be simultaneously bent or swung out of the plane of the body plate at substantially right angles thereto so that the anchoring blades are positioned either vertically or horizontally, depending upon whether the anchoring members are cut longitudinally from the body plate or transversely or across the width of the body plate.

The anchoring members are so formed that the middle portions thereof are hingedly or integrally connected with the body plate to permit the anchoring members to be pivotally swung transversely of the body plate as desired, to position all of the tapered anchoring blades on one side and the rectangular anchoring blades on the opposite side, or said anchoring blades may be projected so that the different shaped blades are staggered with respect to one another on opposite sides of the body plate. It will accordingly be seen that the improved center joint form having each of the integral anchoring blades projecting from opposite sides thereof is adapted for tying adjacent or opposite slabs of adjaent road lanes together without the use of tie bars or the like.

t will, of course, be understood that various details of construction may be varied through a wide range without departing from the principles of this invention, and it is, therefore, not the purpose to limit the patent granted hereon other- Wise than necessitated by the scope of the appended claims.

I claim as my invention:

1. A joint form comprising a plate body, a onepiece anchoring member out therefrom and in the set up condition of the joint form extending from opposite sides of the plate body, the cut edges of the anchoring member on one side of the plate body being offset and discontinuous from the cut edges on the opposite side of said plate body to provide juncture portions between the plate body and the anchoring member, and said juncture portions forming integral bendable connecting hinges by which said anchoring member is bent out of the plane of said plate body.

2. A joint form comprising a plate body, a onepiece anchoring member cut therefrom and in the set up condition of the joint form extending from opposite sides of the plate body, the cut edges of the anchoring member on one side of the plate body being offset and discontinuous from the cut edges on the opposite side of said plate body to provide juncture portions between the plate body and the anchoring member, and said juncture portions forming integral bendable connecting hinges by which said anchoring member is bent out of the plane of said plate body, at least one portion of the anchoring member being of generally dovetail outline.

ROBERT R. ROBERTSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,755,001 Harley Apr. 15, 1930 2,007,955 Cornell, Jr July 16, 1935 

